// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_SIZE_H_
#define UI_GFX_GEOMETRY_SIZE_H_

#include <iosfwd>
#include <string>

#include "base/compiler_specific.h"
#include "base/numerics/safe_math.h"
#include "build/build_config.h"
#include "ui/gfx/gfx_export.h"

#if defined(OS_WIN)
typedef struct tagSIZE SIZE;
#elif defined(OS_MACOSX)
typedef struct CGSize CGSize;
#endif

namespace gfx {

// A size has width and height values.
class GFX_EXPORT Size {
public:
    Size()
        : width_(0)
        , height_(0)
    {
    }
    Size(int width, int height)
        : width_(width < 0 ? 0 : width)
        , height_(height < 0 ? 0 : height)
    {
    }
#if defined(OS_MACOSX)
    explicit Size(const CGSize& s);
#endif

    ~Size()
    {
    }

#if defined(OS_MACOSX)
    Size& operator=(const CGSize& s);
#endif

#if defined(OS_WIN)
    SIZE ToSIZE() const;
#elif defined(OS_MACOSX)
    CGSize ToCGSize() const;
#endif

    int width() const
    {
        return width_;
    }
    int height() const { return height_; }

    void set_width(int width) { width_ = width < 0 ? 0 : width; }
    void set_height(int height) { height_ = height < 0 ? 0 : height; }

    // This call will CHECK if the area of this size would overflow int.
    int GetArea() const;
    // Returns a checked numeric representation of the area.
    base::CheckedNumeric<int> GetCheckedArea() const;

    void SetSize(int width, int height)
    {
        set_width(width);
        set_height(height);
    }

    void Enlarge(int grow_width, int grow_height);

    void SetToMin(const Size& other);
    void SetToMax(const Size& other);

    bool IsEmpty() const { return !width() || !height(); }

    std::string ToString() const;

private:
    int width_;
    int height_;
};

inline bool operator==(const Size& lhs, const Size& rhs)
{
    return lhs.width() == rhs.width() && lhs.height() == rhs.height();
}

inline bool operator!=(const Size& lhs, const Size& rhs)
{
    return !(lhs == rhs);
}

// This is declared here for use in gtest-based unit tests but is defined in
// the gfx_test_support target. Depend on that to use this in your unit test.
// This should not be used in production code - call ToString() instead.
void PrintTo(const Size& size, ::std::ostream* os);

// Helper methods to scale a gfx::Size to a new gfx::Size.
GFX_EXPORT Size ScaleToCeiledSize(const Size& size,
    float x_scale,
    float y_scale);
GFX_EXPORT Size ScaleToCeiledSize(const Size& size, float x_scale);
GFX_EXPORT Size ScaleToFlooredSize(const Size& size,
    float x_scale,
    float y_scale);
GFX_EXPORT Size ScaleToFlooredSize(const Size& size, float x_scale);
GFX_EXPORT Size ScaleToRoundedSize(const Size& size,
    float x_scale,
    float y_scale);
GFX_EXPORT Size ScaleToRoundedSize(const Size& size, float x_scale);

} // namespace gfx

#endif // UI_GFX_GEOMETRY_SIZE_H_
